Roll for heat treating furnaces



R. BURKE ROLL POR HEAT TREATING FURNACES Filed Jan. so. 1929 Juvzzfor- EN w/V WN Aug. 16 1932.

Patented Aug. 1651932 UNITED STATES RALPE BURRE, OF

PATENT OFFICE SPRINGFIELD, OHIO, ASSIGNOR TO THE OHIO STEEL FOUNDRY COM-PANY, OF LIKA, OHIO, A CORPORATION OF OHIO BOLL FOB HEAT TREATINGFURNACES Application filed J'anuary 30, 1929. serial No. assms.

ticles, resulted in a large percenta e of mould-- ing losses. This inaddition to t e hi h cost of heat resisting material utilized in t eroll, is reflected in the high initial cost of such :furnaces as well asmaintenance thereof due to replacement of the rolls.

In carrying out my invention, I provide an improved Construction of rollwherein the enlarged cylindrical portion thei-cof which extends withinthe furnace is made of a separate casting, preferably of heat resistingal loy, while the end portions of the roll w ich provide bearings on theexterior of the fur 26 nace, are made of cheaper metal, but withallowance for expansion and contraction at the joints between theseparate .castings which make up the roll. i

The invention may best be understood by reference to the accompanyingdrawing in which Figure 1 is a transverse section of a portion of afurnace showing my improved form of roll in longitudinal cross section.

Figure 2 is a section of the roll taken on line 2-2 of F igure 1.

Figure 3 is a section of the end casting at the driving end of the rolltaken on line 3-3 of Figure 1.

Referring now to details of the embodiment of my invcntion illustratedhercin, the furnace walls are indicated at 10-10 having apertures 11-11therein through which the roll 12 extends. It will be understood that aplurality of such rolls are provided in substantially horizontalalinement with each other in the usual manner so as to support materialthereon as it passes through the furnace. The rolls are also supportedas usual in hearing supports 15-15 at opposite ends of the roll on theoutside of the furnace asshown. The roll may be driven in anysutable`manner, as for instance, by a gear 16 mounted on a reduced endportion 17 at one end ofthe roll.

Referring now more particularly to the details of Construction whichform the subject matter of my invention, it will be seen that the roll12 is made up of three sections, namely, a main cylindrical section 20and end sections 21 and 22, the latter end section herein being at thedriven end of the roll which carries the ear 16 thereon. The mainsection 20 is pre erably formed of heat rement within the end of themain section 20,

a reduced hearing portion 28 which engages in one of the hearingsupports 15-15 as shown, and a flange portion 29 having a series of lugs30-30 which are adapted to have interlockng engagement in the recesses26--26 formed in the adjacent flange 25 ofthe main section 20. The endcasting 22 is preferably hollow throughout its length as shown so as toprovide ventilation for the roll.

It will be noted that the' reduced extension 17 on which the drivinggear 16 is mounted,

forms an integral continuation of the bear- .ing portion 28 of the endcasting 2 2.

the end thereof, and a reduced hearing portion35 engaged by its rollersupport 15.

From the abovedescr-ption it will now be understood thatthe roller,although made up of three separate parts as described, can be made moreeconomically than by the usual integral molding processes as heretoforeemployed. The use of relatively' expensive heat resisting alloy ispreferably restricted to the main section 20 and this main portion canbe far more easily cast With its relatively large end openings than waspossible when the entire roller including its restricted end portionswere molded by the use of chaplets which were found necessary in orderto support the internal core. If light chaplets were used for thispurpose they would often fuse and allow the core to sag thus causingunevenness and thickness of metal, and if large chaplets were used theywould not fuse into the metal sufliciently and would cause objectionablesurface blemishes. The necessity for chaplets is entirely eliminated informing a uniform section cylindrical casting for the main rollersection 20, as shown herein.

The end castings 21 and 22 are of course relatively simple from themolding standpoint, and owing to the fact that they are removed from themore intensive heat of the furnace, it is possible to make thesecastings of cheaper metal and thus save in the cost of the entire roll.i

The parts are readily assenbled by slipping the end sectionslongitudinally into the main section, the parts preferably havingrelatively loose fitting engagement so as to allow for expansion andcontraction of the associated parts while' in operation. The drivingconnection between the end section 22 and the main roll is especiallysimple in Construction and arrangement since it is effected by slippingthe end member 22 endwise into the main section-20, with the lugs v inregistering position with the notches 26 on said main section.

I claim as my invention:

1. As a new article of manufacture, a roll for heat treating furnacescomprising a hol'- -l'ow central cylindrical main section composed of ahigh heat resisting alloy and substantially of uniform interior crosssection throughout its length, end members each consisting of separatecasting members of a different material having fitting engagement in theends of said central section to permit freedom of expansion andcontraction thereof relative to said separate casting members hearingportions forming supports for opposite ends of the roll and havingopenings therethrough to provide for the ventilation of the roll, andendwise movable interlockin drivng connections between one of said enmembers and said main section. a

2. As a new article of manufacture, a roll for heat treating furnacescomprising a hollow central cylindrical section composed of a high heatresisting alloy and substantially of uniform cross section throughoutits length, end members each consisting of separate pieces of adifferent material having fitting engagement in the ends of said centralsection to permit relative expansion and contraction of the differentmaterials, said end members provided with reduced bearing portions:Eorming supports for opposite ends of the roll and having openingstherethrough to provide for the ventilation of the roll, said centralsection having an outwardly projecting radial flange at one end thereof,and endwise movable interlocking driving connections'between said flangeand one of said end members. p

3. In a heat treating furnace, a roll comprising a hollow cylindr-icalcentral main section composed'of a high heat resisting alloy andsubstantially uniform interior cross section throughout its lengthextending transversely of the furnace with its ends extending throughthe side walls thereof, end castings of different material formed hollowfor ventilating the roll and providing supports extending inwardly ofthe side walls of the ends of said main section and reduced journalmembers extending outwardly from said side walls of the furnace, fixedbearing mem-` -ings of different material having enlarged cylindricaldportions fitted endwise into the bore of sai central section and havingreduced bearing portions forming supports for o posite ends of the roll,said end members a so being hollow for ventilation of the roll throughsaid reduced bearing portions, and means whereby said central sectionmay be driven by the rotation of one end member,

comprising an outwardly extending flange on its enlarged cylindricalportion abutting the extreme end ofisaid central section, and meanseonnectin the abutting' portions of said flange an said central section.said end members provided with I reduced v January, 1929.

Sgned at Springfield this 25th day of RALPH BURKE.

-furnace having fitting engagement in the

